If someone leaves a comment on my post and I want to reply back to them, how can I make sure they get my reply? In Twitter you append an at symbol to the front of their name to create an @reply message. Is there an equivalent in Google+? If so, how do I reply to a specific comment?

Ampersand is "&". "@" is "at". Not sure if it has a better name than that. (Hey, that rhymed!)
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Anna Lear♦Jul 19 '11 at 15:09

4

On another note, replying in G+ seems similar: you start with @ and then auto-complete for the names of people who commented should kick in. I've seen it not always work as expected, though, so I'm not going to post this as an answer.
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Anna Lear♦Jul 19 '11 at 15:10

@Anna: Thanks for the correction, and the answer. That did work. I kept looking for any kind of button or link when I should have just tried it. :)
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Bill the LizardJul 19 '11 at 15:13

1

Using the @ should work exactly the same as using + as it appears to convert it to + anyway.
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Barry♦Jul 19 '11 at 15:29